<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="./vue.js"></script>
</head>
<body>
  <div id="box">
    {{ msg  }}
    
  </div>
  
  <script>

    let vm = new Vue({
      data:{
        msg:"hello vue"
      }
    });
    vm.$mount(document.querySelector("#box"));
  </script>
</body>
</html>